Indicator reducing-motion for engines



(No Model) 0. P. TURNER & D. L. MEKEEL. INDICATOR REDUCING MOTION FOR ENGINES.

No. 555,668. Patented Mar. 3, 1896.

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CHARLES P. TURNER AND DAVID L. MEKEEL, OF ELYRIA, OHIO.

INDICATOR REDUCING-MOTION FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 555,668, dated March 3, 1896.

Application filed January 16, 1895.

To all whom it may concern.-

Be it known that we, CHARLES P. TURNER and DAVID L. MEKEEL, citizens of the United States, residing at Elyria, in the county of Lorain and State of Ohio, have'invented a new and useful Indicator Reducing-Motion for Engines, of which the followingis a specification.

Our invention relates to improvements in indicator reducing-motions for engines, in which the reducing-m otion is operated by and connected with the piston-rod, cross-head, or other reciprocating part of the engine; and the object of the invention is to provide an indicator reducing-motion for steam-engines that will give an exact reduction of the motion of the cross-head, be light and simple in construction, easily applied, and obviate the use of long cords between the reducing-motion and the indicator; also to provide a device by which the motion of the paper-drum may be easily stopped for the purpose of the position of the diagram to the proper posit-ion on the card.

The figure is an elevation, partly in section, showing my invention.

The invention consists of a cylinder 1, which may be fastened to the engine-bed in any convenient manner. Working in the cylinder is a plunger 2, which is attached to and driven by the engine cross-head 20. A second cylinder 3 is connected with cylinder 1 by a pipe 4, which may for convenience be a flexible hose. The cylinder 3 is provided with a piston 8, which connects with the indicator-cord 5 by means of the piston-rod 6,passin g through a stuffingbox 7 ,which may be of any approved construction. The cord 5 is attached at one end to the cylinder bearing the indicator-card 22 and at the other end to the outer end of the piston-rod 6, thereby connecting the same.

In order to stop the motion of the piston 8 the connection between the cylinder 1 and cylinder 3 is provided with a cook 11 and bypass valve 12. For filling the machine with water and adjusting the tension of the spring 9 and position of piston 8 in its cylinder there is provided an inlet-valve 13, which is so arranged as to be automatic in its action, as described below.

In use the cylinder 1, together with connectser'mi No. 535,082. (No model.)

ing-pipe 4 and space in cylinder 3 back of the piston 8, are filled with water or any convenient liquid, which serves to communicate the motion of the plunger 2 to the piston 8, the relative motion of said plunger and piston being regulated by the relation between their areas. In order to secure the return of the piston 8 for the backward motion of the plunger it is provided with a spring 9, which may be of metal, but in the present case consists of air under compression. In order to confine the air and prevent the liquid back of the piston 8 from leaking past it into the air-space the air is confined in an air-chamber 21, and the space in the cylinder between the piston 8 and air-chamber 21 is filled with the liquid 23, which communicates the pressure of the air to the piston and serves to prevent any air from leaking through stuffing-box 7.

To stop the motion of the paper-drum of the indicator the cock 11 is closed and the liquid is then forced through the by-pass valve, which consists of an ordinary check-valve 12, with its back toward the stuffing-box 7, which thereby permits the liquid to pass through the same with the forward motion of the plunger 2 and prevents the return of the liquid with the return motion of the plunger.

To adjust the piston to its proper position and regulate the pressure of the air in the airchamber the cook 11 is closed and communication to a supply of liquid opened through valve 13 and pipe 14:. The machine then acts as a pump, drawing the liquid from the supply and forcing it through valve 12 into the cylinder 3, or by opening the cock 17 theliquid may be forced into the air-chamber 21 through pipe 15.

To prevent the pressure from becoming too great in the air-chamber and cylinder the inlet-valve 13 has a stem projecting into the space 3, which stem is so proportioned as to automatically close the valve when the pressure becomes great enough.

IVhat we claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an indicator reducing-motion for steam-engines the combination of the moving parts of an engine with the cylinder 1, plunger 2, and connecting-pipe at, filled with a liquid 23 connected, by intermediate mechanism, with the cylinder bearing the indicator-card 22, all as above set forth and substantially as described.

2. In an indicator reducingmotion for steam-engines the air-spring 9 in combination with the air-chamber 21 piston 8, cylinder 3, liquid 23, and tube 4, all for the purposes above set forth and substantially as described.

3. In an indicator reducing-motion for steam-engines, the combination of the cock 11, check-valve 12, liquid 23, cylinder 3, and rod 6 connected by any intermediate mech- 

